package com.example.headview;

import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;

public class MainActivity extends AppCompatActivity {
    /* 头像文件 */
    private static final String IMAGE_FILE_NAME = "temp_head_image.jpg";

    /* 请求识别码 */
    private static final int CODE_GALLERY_REQUEST = 0xa0;
    private static final int CODE_CAMERA_REQUEST = 0xa1;
    private static final int CODE_RESULT_REQUEST = 0xa2;

    // 裁剪后图片的宽(X)和高(Y),480 X 480的正方形。
    private static int output_X = 480;
    private static int output_Y = 480;

    private ImageView headImage = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        headImage = (ImageView) findViewById(R.id.imageView);

        Button buttonLocal = (Button) findViewById(R.id.buttonLocal);
        buttonLocal.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                choseHeadImageFromGallery();
            }
        });

        Button buttonCamera = (Button) findViewById(R.id.buttonCamera);
        buttonCamera.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                choseHeadImageFromCameraCapture();
            }
        });
    }

    // 从本地相册选取图片作为头像
    private void choseHeadImageFromGallery() {
        Intent intentFromGallery = new Intent();
        // 设置文件类型
        intentFromGallery.setType("image/*");
		intentFromGallery.setAction(Intent.ACTION_GET_CONTENT);
		startActivityForResult(intentFromGallery, CODE_GALLERY_REQUEST);
	}

	// 启动手机相机拍摄照片作为头像
	private void choseHeadImageFromCameraCapture() {
		Intent intentFromCapture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

		// 判断存储卡是否可用，存储照片文件
		if (hasSdcard()) {
			intentFromCapture.putExtra(MediaStore.EXTRA_OUTPUT, Uri
					.fromFile(new File(Environment
							.getExternalStorageDirectory(), IMAGE_FILE_NAME)));
		}

		startActivityForResult(intentFromCapture, CODE_CAMERA_REQUEST);
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode,
			Intent intent) {

		// 用户没有进行有效的设置操作，返回
		if (resultCode == RESULT_CANCELED) {
			Toast.makeText(getApplication(), "取消", Toast.LENGTH_LONG).show();
			return;
		}

		switch (requestCode) {
		case CODE_GALLERY_REQUEST:
			cropRawPhoto(intent.getData());
			break;

		case CODE_CAMERA_REQUEST:
			if (hasSdcard()) {
				File tempFile = new File(
						Environment.getExternalStorageDirectory(),
						IMAGE_FILE_NAME);
				cropRawPhoto(Uri.fromFile(tempFile));
			} else {
				Toast.makeText(getApplication(), "没有SDCard!", Toast.LENGTH_LONG)
						.show();
			}

			break;

		case CODE_RESULT_REQUEST:
			if (intent != null) {
				setImageToHeadView(intent);
			}

			break;
		}

		super.onActivityResult(requestCode, resultCode, intent);
	}

	/**
	 * 裁剪原始的图片
	 */
        public void cropRawPhoto(Uri uri) {

            Intent intent = new Intent("com.android.camera.action.CROP");
            intent.setDataAndType(uri, "image/*");

		// 设置裁剪
		intent.putExtra("crop", true);

		// aspectX , aspectY :宽高的比例
		intent.putExtra("aspectX", 1);
		intent.putExtra("aspectY", 1);

		// outputX , outputY : 裁剪图片宽高
		intent.putExtra("outputX", output_X);
		intent.putExtra("outputY", output_Y);
		intent.putExtra("return-data", true);

		startActivityForResult(intent, CODE_RESULT_REQUEST);
	}

	/**
	 * 提取保存裁剪之后的图片数据，并设置头像部分的View
	 */
            private void setImageToHeadView(Intent intent) {
                Bundle extras = intent.getExtras();
                if (extras != null) {
                    Bitmap photo = extras.getParcelable(intent.getDataString());
                    headImage.setImageBitmap(photo);
                }
            }

            /**
             * 检查设备是否存在SDCard的工具方法
             */
        public static boolean hasSdcard() {
            String state = Environment.getExternalStorageState();
            if (state.equals(Environment.MEDIA_MOUNTED)) {
                // 有存储的SDCard
                return true;
            } else {
                return false;
            }
        }
    }

